With the spread of the bomb came a logic—a stab at a strategy—on how to deter its use in warfare. The logic involved convincing adversaries that you really would use the bomb in response to aggression; part of that involved convincing yourself that you would use it, which required building certain types of missiles, and devising certain plans, that would enable you to use them—and, before you knew it, a strategy to deter nuclear war became synonymous with a strategy to fight nuclear war. And when crises arose, the logic encouraged, almost required, escalating the cycle of threats and
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